('.78 



Dll. Jl. UiuxjM ON TilK STllUCTUllE OF THE SKULL 



Tlie ai'ticniliir is a strong short bone, which lias on its posterior 

 face a broad concave articulation for the quadrate and possibly 

 the quadrato-jugal. Jnferiorly there IuIkS been a ])o\verful 

 de.sconding articular process. Tiie front part of the articular is 

 on the inner side clasped by the prearticnlar. 



1 h:\.vo figured six transvei'so sections of the jaw taken at the 

 [>oints marked in the figures. Though the sections are all 



O.D. E.E. 



'rniiisver^o sections of the jaw of Tilanvsiichus cloetci Urooiu at the points 

 inilifutcd liy tho corrcsiionding li'ltei's on tlie (ijjuves of the jinv. 



fractures, they are so nearly transveise that they may be regarded 

 as sections. 



Section A, A. — This section is through the 10th molar, Avhich 

 is a replacing tooth just becoming functional. The greater part 

 of the jaw is here formed by the dentary. I^elow and on the 

 inner side is seen a section of the splonial, and in the cavity of 

 tho jaw are a few bony s[)icules, somewhat crushed and displaced, 

 which represent the anterior end of the angular. 



